Background

Implantable pacemakers and implantable cardioverter-defibrillators (ICDs) are designed to include a “magnet mode” feature that can be activated from magnets stronger than 10 G. This feature is designed to be used when a patient is undergoing a procedure where electromagnetic interference is possible, or anytime suspension of tachycardia detection and therapy is needed. A publication in Heart Rhythm demonstrates an iPhone 12 triggering the magnet mode of a Medtronic ICD.

Objective

The purpose of this study is to determine the separation distance between consumer electronic devices that may create magnetic interference, including cell phones and smart watches, and implantable pacemakers and ICDs where magnet mode can be triggered.

Methods

The static magnetic fields of the iPhone 12 models and Apple Watch were measured at several planes in 1 cm resolution using an FW Bell 5180 Gauss Meter with STD18-0404 Transverse probe (unidirectional probe).

Results

All iPhone 12 and Apple Watch 6 models tested have static magnetic fields significantly greater than 10 G in close proximity (1–11 mm), which attenuates to below 10 G between 11 and 20 mm.

Conclusion

The findings of this study support the US Food and Drug Administration recommendation that patients keep any consumer electronic devices that may create magnetic interference, including cell phones and smart watches, at least 6 inches away from implanted medical devices, in particular pacemakers and cardiac defibrillators.

中文翻译：

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智能手机和手表的静态磁场测量以及在植入式起搏器和植入式心脏复律除颤器中触发磁铁模式的适用性

背景

植入式起搏器和植入式心律转复除颤器 (ICD) 设计为包含“磁铁模式”功能，可通过 10 G 以上的磁铁激活。此功能设计用于患者接受可能产生电磁干扰的手术时，或任何时候需要暂停心动过速检测和治疗。Heart Rhythm上的一篇文章展示了 iPhone 12 触发了美敦力 ICD 的磁铁模式。

客观的

本研究的目的是确定可能产生磁干扰的消费电子设备（包括手机和智能手表）与可触发磁模式的植入式起搏器和 ICD 之间的间隔距离。

方法

使用配备 STD18-0404 横向探头（单向探头）的 FW Bell 5180 高斯计在多个平面上以 1 厘米的分辨率测量 iPhone 12 机型和 Apple Watch 的静磁场。

结果

测试的所有 iPhone 12 和 Apple Watch 6 型号在近距离（1-11 毫米）处的静磁场明显大于 10 G，在 11 到 20 毫米之间衰减到 10 G 以下。

结论

这项研究的结果支持美国食品和药物管理局的建议，即患者将任何可能产生磁干扰的消费电子设备（包括手机和智能手表）与植入的医疗设备（尤其是起搏器和心脏除颤器）保持至少 6 英寸的距离。